Outer sealing structure of hydraulic oil cylinder

Abstract

The invention discloses an outer sealing structure of a hydraulic oil cylinder and belongs to the field of oil cylinder sealing. In the moving process of a piston rod, a sealing-assisting cover on a moving side end cover moves towards a ring body under the action of gradually-increased oil pressure, so that the ring body is extruded and is deformed in the radial direction, the contact area between the ring body and the inner wall of the oil cylinder is greatly increased, and the sealing effect is improved. When the ring body is aged, the toughness of the ring body is weakened, the moving span of the sealing-assisting cover is increased, the compression deformation of the ring body is increased, and the contact area with the inner wall is larger, so that the problem of poor sealing caused by aging is effectively solved, and the condition of leakage is effectively avoided; besides, when the inner leakage state occurs, the oil pressure is reduced, so that the stress at the self-resetting connecting layer is reduced, the deformation of the inner compound light hemisphere is small, and the data on the sensor is obviously reduced, and therefore, early warning is performed on workers at the initial stage of the inner leakage, and the influence is reduced.

Description

technical field [0001] The invention relates to the field of oil cylinder seals, and more specifically relates to an outer sealing structure of a hydraulic oil cylinder. Background technique [0002] The seal is a mechanism that prevents the leakage of working medium (internal leakage and external leakage) and prevents external foreign matter (such as air, dust and water, etc.) from entering hydraulic components and hydraulic systems. [0003] In order to ensure that the hydraulic oil in the cylinder is not easy to leak, a sealing ring is provided outside the end cover, which is in contact with the inner wall of the oil cylinder and the surface of the end cover to achieve sealing. The seal here is a static seal. However, when it is in the squeezed state for a long time, The sealing ring is prone to aging, which causes its sealing performance to gradually weaken, resulting in external leakage; in addition, external leakage can be found with the naked eye, but when internal le...

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Problems solved by technology

[0003] In order to ensure that the hydraulic oil in the cylinder is not easy to leak, a sealing ring is provided outside the end cover, which is in contact with the inner wall of the oil cylinder and the surface of the end cover to achieve sealing. The seal here is a static seal. However, when it is in the squeezed state for a long time, The sealing ring is prone to aging, which causes its sealing performance to gradually weaken, resulting in external leakage; in addition, external leakage can be found with the naked eye, but when internal leakage occurs at the dynamic seal between the piston rod and the cylinder, in the prior art, generally It is judged whether there is internal leakage by the change of oil temperature or its action. This method is generally found after a relatively long time after the occurrence of internal leakage. quality suffers

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